Perhaps you should try some spelling variations:
thuoc mach » thuoc sach, thuong mach, thuoc ma
trien khoa » trien nha, trien hoat, trien khai
hoc trien » hoc tren, hoc tien, hoc truyen
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
phan dau » phan tu, hang dau
cuu mon » cuu mot, cuu cong, cuu tong
va phan » van phan, va phat, va phap
hoc xa » hoc ma

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc mach hoc tap, nghien ((cuu mon) or (cuu mo)) hoc trien khoa hoc xa hoi va phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc mach hoc tap, nghien ((cuu mon) OR (cuu mo)) hoc trien khoa hoc xa hoi va phan dau.
• Adding a wildcard symbol may retrieve word variants: thuoc mach hoc tap, nghien ((cuu mon) or (cuu mo)) hoc trien khoa hoc xa hoi va phan dau*.